If you've been underwhelmed by the flash card and study aid sites you've found online, you'll definitely want to check out Headmagnet. Headmagnet records what you remember and quizzes you in the most efficient way.

Most study sites let you create study lists and flash cards, then they just send you back through the same pile over and over again. Headmagnet actually tracks what you're recalling and what you're not and tweaks your study routines to help you recall the things you're forgetting. Check out the video below:

In addition to tracking your scores to tweak your flash card stacks, Headmagnet lets you view the stats yourself. You can check out how well you're doing, how frequently you've been studying, and crunch the numbers to see if your study time is paying off.